Chache dns entry

Hi. my workplace DNS server seems to have something against

When in the morning i hook up my laptop to the network, it does not recognize (and is another example). However works fine.

No matter how many times i refresh the browser, it just wont resolve the name. I have to manually do a nslookup for these hosts with a longer timeout setting (20 sconds usually). Only then it caches the names. Is there a way to tell the dns server to hold this address slightly longer? i dont have admin access to the server.

You could use OpenDNS if you can change the setting on your PC?